Bathing basin insert



FIG. 1 is a top front perspective view of a bath basin insert showing the claimed design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a rear side view thereof;

FIG. 5 is a front side view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The dashed broken lines in the figures show portions of the bathing basin insert that form no part of the claimed design. 

CLAIM The ornamental design for a bathing basin insert, as shown and described. 